<template>
  <div class="app-container">
    <el-form label-width="120px">
      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">
          <!-- 头衔缩略图 -->
          <pan-thumb :image="teacher.avatar"/>
          <!-- 文件上传按钮 -->
          <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像
          </el-button>

          <!--
            v-show：是否显示上传组件
            :key：类似于id，如果一个页面多个图片上传控件，可以做区分
            :url：后台上传的url地址
            @close：关闭上传组件
            @crop-upload-success：上传成功后的回调 -->
          <image-cropper
                        v-show="imagecropperShow"
                        :width="300"
                        :height="300"
                        :key="imagecropperKey"
                        :url="BASE_API+'/eduoss/file/upload'"
                        field="file"
                        @close="close"
                        @crop-upload-success="cropSuccess"/>

      </el-form-item>

      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name"/>
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right"/>
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
          -->
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career"/>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
      </el-form-item>

      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import teacherApi from '@/api/edu/teacher'
// 引入组件，用于图片上传
import ImageCropper from '@/components/ImageCropper'
import PanThumb from '@/components/PanThumb'

export default {
  components: { ImageCropper, PanThumb },
  data() {
    return {
      BASE_API:process.env.BASE_API,  // 将config里面保存的BASE_API取出来，固定写法
      imagecropperShow:false,  // 默认不弹框，给一个初始值。只有在被按下只有，再弹出来
      imagecropperKey: 0,  // 唯一标识
      teacher: {
      },
      saveBtnDisabled : false,
    }
  },

  created() {
    this.init()
  },
  // 监听，每次路由发生变化，就更新一次
  watch: {
    $route(to, from) {
      this.init()
    }
  },

  methods: {
    close() {
      this.imagecropperShow=false
      // 上传失败后，重新打开上传组件时初始化组件，否则显示上一次的上传结果
      this.imagecropperKey = (this.imagecropperKey + 1) % 2
    },

    // 上传成功后的回调函数
    cropSuccess(data) {
      this.imagecropperShow = false
      this.teacher.avatar = data.url  // 回显上传的头像
      // 上传成功后，重新打开上传组件时初始化组件，否则显示上一次的上传结果
      this.imagecropperKey = (this.imagecropperKey + 1) % 2
    },

    init() {
      // 如果存在路由参数，那就取值，没有那就算了直接把teacher清空
      if (this.$route.params && this.$route.params.id) {
        const id = this.$route.params.id
        this.getTeacherById(id)
      } else {
        this.teacher = {}
      }
    },
    saveOrUpdate() {
      this.saveBtnDisabled = true
      if (this.teacher.id) {
        this.updateDate(this.teacher)
      } else {
        this.saveData(this.teacher)
      }
    },

    getTeacherById(id) {
      teacherApi.getTeacherById(id)
        .then(response => {
          this.teacher = response.data.data
        })
    },

    // 保存
    saveData(teacher) {
      teacherApi.insertTeacher(teacher)
      .then(response => {
        if(response.success === true) {
          this.$message({
                  type: 'success',
                  message: '添加成功!'
          });
        }
        this.$router.push( {path: '/teacher/table'} )
      })
      .catch(error => {
        this.$message({
          type: 'error',
          message: '添加失败!'
        });
      })
    },

    updateDate(teacher) {
      teacherApi.updateTeacherById(teacher)
        .then(response => {
          if(response.success === true) {
            this.$message({
              type: 'success',
              message: '修改成功!'
            });
          }
          this.$router.push( {path: '/teacher/table'} )
        })
        .catch(error => {
          this.$message({
          type: 'error',
          message: '修改失败!'
          });
        })
    },
  }
}
</script>